One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(5,6,9,13)(7,10,14,18)(8,11,16,12)(15,17,20,19)(21,22,26,30)(23,31,34,35)(24,28,25,29)(27,32,36,33)(1,2)(3,4)(5,7)(6,10)(8,15)(9,14)(11,17)(12,19)(13,18)(16,20)(23,32)(24,25)(27,35)(28,29)(31,36)(33,34) involution — undirected(1,3,4,2)(6,11)(8,16)(10,17)(12,13)(15,20)(18,19)(21,23)(22,27)(24,32)(25,33)(26,34)(28,31)(29,35)(30,36)(7,14)(10,18)(15,20)(17,19)(21,24,26,25)(22,28,30,29)(23,32,34,33)(27,31,36,35)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.